Are all the ueic remotes able to use all the codes at hifiremote or are each limited to use certain ones?also why are the setup codes for a mx500 three digit and the ueic ones four digit? I'm trying to see if the discrete codes are available for my components at the hifiremote website so how do i know which four digit code correspondes to my component? Any help appreciated

The mx-500's code #'s are different because it's from a different company then UEIC. Just like Sony's are different then RCA's. Before you can use advanced codes you need to find a working device code,and the only way your going to find out is to buy a OFA remote. But if want to look at a list of UEIC device codes see here;

[Link: hifi-remote.com]

Jimmy,
Most of the "better" ueic remotes (OFA or Radio Shack) remotes will have most of the setup codes you see at hifi-remote. However, The older models won't have the newer codes, and the newer models may not have some of the older codes. HOWEVER, with JP-1 that doesn't matter cuz if it isn't in there, you can put it in. Just make sure you have a JP-1 capable remote, preferably a learner (makes a great tool).
Virtually NO remote companies use the same device setup codes, that's why this forum is riddled with "need code" posts. RCA uses different from zenith, which are different than denon, which are different from xxxx, etc. However, all the ueic remotes whether wearing the OFA or RS badges all use the same ones. The RCA 810 also uses ueic codes, but they are offset by 17 (just the device setup codes, not advance codes). I think there were some others in the past that used this offset scheme as well.
Jim

Each remote is loaded with a subset of codes from the master UEIC database, as new devices come along, older codes will get dropped from the remotes.

Rob
http://www.hifi-remote.com

Thanks for the help